US9278096B2 - Therapeutic uses of compounds having combined SERT, 5-HT3 and 5-HT1A activity - Google Patents

Therapeutic uses of compounds having combined SERT, 5-HT3 and 5-HT1A activity Download PDF

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US9278096B2
US9278096B2 US12/741,780 US74178008A US9278096B2 US 9278096 B2 US9278096 B2 US 9278096B2 US 74178008 A US74178008 A US 74178008A US 9278096 B2 US9278096 B2 US 9278096B2
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patient
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Marianne Dragheim
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    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A—HUMAN NECESSITIES
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    • A61P9/00—Drugs for disorders of the cardiovascular system

Definitions

  • the present invention relates to the therapeutic use of compounds which have a combined SERT, 5-HT 3 and 5-HT 1A activity.
  • SSRI serotonin reuptake inhibitors
  • CNS related diseases such as e.g. depression, anxiety and schizophrenia are often co-morbid with other disorders or dysfuntionalities, such as cognitive deficits or impairment [ Scand. J. Psych., 43, 239-251, 2002 ; Am. J. Psych., 158, 1722-1725, 2001].
  • cholinergic system plays a prominent role in cognition, and compounds affecting the cholinergic system are thus potentially useful for the treatment of cognitive impairment.
  • Compounds affecting the 5-HT 1A receptor and/or the 5-HT 3 receptor are known to affect the cholinergic system, and they may as such be useful in the treatment of cognitive impairment.
  • a compound exerting 5-HT 1A and/or 5-HT 3 receptor activity would be expected to be useful in the treatment of cognitive impairment.
  • a compound which moreover also exerts SERT activity would be particular useful for the treatment of cognitive impairment in patients who are also suffering from a diseases which will benefit from a (faster) increase in the serotonin levels.
  • the present inventors have surprisingly found that 1-[2-(2,4-dimethylphenylsulfanyl)-phenyl]piperazine exerts a combination of SERT inhibition, 5-HT 3 antagonism and 5-HT 1A agonism. Accordingly, the invention provides a method for the treatment of diseases, the method comprising the administration of a therapeutically effective amount of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]-piperazine or a pharmaceutically acceptable salt thereof to a patient in need thereof.
  • the invention relates to the use of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piperazine or a pharmaceutically acceptable salt thereof in the manufacture of a medicament for the treatment of diseases.
  • the invention provides 1-[2-(2,4-dimethylphenylsulfanyl)-phenyl]piperazine or a pharmaceutically acceptable salt thereof for use in the treatment of diseases.
  • FIG. 1 XRPD of crystalline base
  • FIG. 2 XRPD of alpha form of hydrobromide salt
  • FIG. 3 XRPD of beta form of hydrobromide salt
  • FIG. 4 XRPD of gamma form of hydrobromide salt
  • FIG. 5 XRPD of hemi hydrate of hydrobromide salt
  • FIG. 6 Change in the HAM-D rating item 4 (Insomnia Early) for placebo, 5 mg and 10 mg compound I (HBr salt) over 6 weeks. There was approximately 100 patients in each group
  • FIG. 7 Change in the HAM-D rating item 5 (Insomnia Middle) for placebo, 5 mg and 10 mg compound I (HBr salt) over 6 weeks. There was approximately 100 patients in each group
  • FIG. 8 Change in the HAM-D rating item 6 (Insomnia Late) for placebo, 5 mg and 10 mg compound I (HBr salt) over 6 weeks. There was approximately 100 patients in each group
  • FIG. 9 Effect of compound I in the intradermal formalin test.
  • X-axis shows the amount of compound administred;
  • Y-axis shows the amount of time (sec) spent licking the paw.
  • FIG. 9 a Response in the 0-5 minutes period;
  • FIG. 9 b Response in the 20-30 minutes period.
  • FIG. 10 a Extra-cellular acetylcholine levels in prefrontal cortex in freely moving rats upon administration of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piperazine HBr salt.
  • FIG. 10 b Extra-cellular acetylcholine levels in ventral hippocampus in freely moving rats upon administration of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piperazine HBr salt.
  • FIG. 11 Effect of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piperazine HBr salt on contextual fear conditioning in Sprague-Dawley rats when given 60 minutes before acquisition. Freezing behaviour was scored during 58-s habituation period prior to the foot shock US (pre-shock acquisition) (white bars). Freezing behaviour was measured 24 h after the training (retention test) (black bars).
  • FIG. 12 Effect of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piperazine HBr salt on contextual fear conditioning in Sprague-Dawley rats when given 1 h prior to the retention test. Freezing behaviour was scored during 58-s, prior to the foot shock US (acquisition) (white bars). Freezing behaviour was measured 24 h after the training (retention test) (black bars).
  • FIG. 13 Effect of 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piperazine HBr salt on contextual fear conditioning in Sprague-Dawley rats when given immediately after the acquisition. Freezing behaviour was scored during 58-s, prior to the foot shock US (pre-sock acquisition) (white bars). Freezing behaviour was measured 24 h after the training (retention test) (black bars).
  • the invention relates to the use of compound I, i.e. 1-[2-(2,4-dimethylphenyl-sulfanyl)-phenyl]piperazine, the structure of which is
  • said pharmaceutically acceptable salts are acid addition salts of acids that are non-toxic.
  • Said salts include salts made from organic acids, such as maleic, fumaric, benzoic, ascorbic, succinic, oxalic, bis-methylenesalicylic, methanesulfonic, ethanedisulfonic, acetic, propionic, tartaric, salicylic, citric, gluconic, lactic, malic, mandelic, cinnamic, citraconic, aspartic, stearic, palmitic, itaconic, glycolic, p-aminobenzoic, glutamic, benzenesulfonic, theophylline acetic acids, as well as the 8-halotheophyllines, for example 8-bromotheophylline.
  • Said salts may also be made from inorganic salts, such as hydrochloric, hydrobromic, sulfuric, sulfamic, phosphoric and nitric acids. Particular mentioning is made of salts made from methanesulfonic acid, maleic acid, fumaric acid, meso-tartaric acid, (+)-tartaric acid, ( ⁇ )-tartaric acid, hydrochloric acid, hydrobromic acid, sulphuric acid, phosphorous acid and nitric acid. Distinct mentioning is made of the hydrobromide salt.
  • the invention relates to the use of compound I as disclosed provided said compound is not the free base of 1-[2-(2,4-dimethylphenylsulfanyl)-phenyl]piperazine in a non-crystalline form.
  • Oral dosage forms, and in particular tablets, are often preferred by the patients and the medical practitioner due to the ease of administration and the consequent better compliance.
  • the active ingredients are crystalline.
  • the invention relates to the use of compounds that are crystalline.
  • the crystallinity of compounds used in the present invention is evidenced by the XRDP shown in FIGS. 1-5 .
  • WO 2007/144005 discloses XRPD reflections of further salts used in the present invention.
  • the table below summarises the major XRDP reflections of some compounds used in the present invention.
  • the crystals used in the present invention are solvates, i.e. crystals wherein solvent molecules form part of the crystal structure.
  • the solvate may be formed from water, in which case the solvates are often referred to as hydrates.
  • the solvates may be formed from other solvents, such as e.g. ethanol, acetone, or ethyl acetate.
  • the exact amount of solvate often depends on the conditions. For instance, hydrates will typically loose water as the temperature is increased or as the relative humidity is decreased.
  • the compounds of the present invention are unsolvated crystals.
  • Some compounds are hygroscopic, i.e. they absorb water when exposed to humidity. Hygroscopicity is generally regarded as an undesired property for compounds that are to be presented in a pharmaceutical formulation, in particular in a dry formulation, such as tablets.
  • the invention provides crystals with low hygroscopicity.
  • the term “well-defined” in particular means that the stoichiometry is well-defined, i.e. that the ratio between the ions forming the salt is the ratio between small integers, such as 1:1, 1:2, 2:1, 1:1:1, etc.
  • the compounds of the present invention are well-defined crystals.
  • the crystalline compounds used in the present invention may exist in more than one form, i.e. they may exist in polymorphic forms. Polymorphic forms exist if a compound can crystallize in more than one form. The present invention is intended to encompass all such polymorphic forms, either as pure compounds or as mixtures thereof.
  • the present invention uses compounds in a purified form.
  • purified form is intended to indicate that the compound is essentially free of other compounds or other forms of the same compound, as the case may be.
  • compounds used in the present invention, in casu the hydrobromide salt may exist in several forms, i.e. be polymorphic.
  • the polymorphic forms have different properties, and as shown in example 2.
  • the beta form of the hydrobromide salt is the more stable as demonstrated by the higher DSC melting point and the lower solubility.
  • the beta form has an attractive combination of low hygroscopicity and solubility, which makes this compound particular suited for making tablets.
  • the invention provides the use of the hydrobromide salt of 1-[2-(2,4-dimethylphenylsulphanyl)-phenyl]piperazine with XRDP reflections at approximately 6.89, 9.73, 13.78 and 14.62 (°2 ⁇ ), and in particular with an XRPD as shown in FIG. 3 .
  • solubility of an active ingredient is also of significance for the choice of dosage form as it may have a direct impact on bio-availability.
  • a higher solubility of the active ingredient is generally believed to be beneficial as it increases the bio-availability.
  • compounds of the present invention display a marked antagonism at the human 5-HT 3 receptor as observed on the 5-HT 3 receptor from other species.
  • the data also shows that the compounds used in the present invention are agonists at the 5-HT 1A receptor with a K i value of 15 nM and 96% intrinsic activity (or efficacy).
  • WO 2007/144005 discloses slightly different values. It is, however, believed that this difference is a matter of degree and that it does not call for a fundamental change in the perception of the compound.
  • atypical anti-psychotics such as clozapine, which are also 5-HT 1A agonists enhance cognition in schizophrenic patients
  • typical anti-psychotics such as haloperidol which have no 5-HT 1A activity
  • the 5-HT 3 antagonist alosetron attenuated scopolamine induced deficits in verbal and spatial memory [Preston, Recent Advances in the treatment of Neurodegenerative disorders and cognitive function, 1994, (eds.) Racagni and Langer, Basel Karger, p. 89-93].
  • the compounds of the present invention give rise to an increase in the extra-cellular level of acetylcholine in the prefrontal cortex and the ventral hippocampus in rats.
  • These pre-clinical findings are expected to translate into a clinical effect in the treatment of cognitive impairments, cf. the use of acetylcholine esterase inhibitors in the treatment of cognitive impairments, e.g. in Alzheimer's disease. Further support to this position can be found in example 6, wherein data show that compounds of the present invention enhance contextual memory in rats.
  • Cognitive impairment is among the classic features of depression, such as e.g. major depressive disorder. Cognitive disorders may to some extend be secondary to depression in the sense that an improvement in the depressive state will also lead to an improvement of the cognitive impairment. However, there is also clear evidence that cognitive disorders are, indeed, independent from depression. For instance, studies have shown persistent cognitive impairment upon recovery from depression [ J. Nervous Mental Disease, 185, 748-754, 1997]. Moreover, the differential effect of antidepressants on depression and cognitive impairments lends further support to the notion that depression and cognitive impairment are independent, albeit often co-morbid conditions.
  • Cognitive functions are often impaired in schizophrenic patients, and may form part of the so-called negative symptoms of schizophrenia. Cognitive functions are also impaired in ADHD patients.
  • Cognitive deficits or cognitive impairment include a decline in cognitive functions or cognitive domains, e.g. working memory, attention and vigilance, verbal learning and memory, visual learning and memory, reasoning and problem solving e.g. executive function, speed of processing and/or social cognition.
  • cognitive deficits or cognitive impairment may indicate deficits in attention, disorganized thinking, slow thinking, difficulty in understanding, poor concentration, impairment of problem solving, poor memory, difficulties in expressing thoughts and/or difficulties in integrating thoughts, feelings and behaviour, or difficulties in extinction of irrelevant thoughts.
  • cognitive deficits or cognitive impairment may indicate deficits in attention, disorganized thinking, slow thinking, difficulty in understanding, poor concentration, impairment of problem solving, poor memory, difficulties in expressing thoughts and/or difficulties in integrating thoughts, feelings and behaviour, or difficulties in extinction of irrelevant thoughts.
  • the terms “cognitive deficits” and “cognitive impairment” are intended to indicate the same and are used interchangeably.
  • compound I may be useful in the treatment of pain and affective or mood disorders, such as depression and anxiety associated with pain, and in particular chronic pain.
  • Chronic pain includes indications such as phantom limb pain, neuropathic pain, diabetic neuropathy, post-herpetic neuralgia (PHN), carpal tunnel syndrome (CTS), tasus tunnel syndrome, ulnar nerve entrapment, spinal compression, HIV neuropathy, complex regional pain syndrome (CPRS), trigeminal neuralgia/trigeminus neuralgia/tic douloureux, surgical intervention (e.g.
  • diabetic vasculopathy capillary resistance or diabetic symptoms associated with insulitis, pain associated with angina, pain associated with menstruation, pain associated with cancer, dental pain, headache, migraine, tension-type headache, trigeminal neuralgia, temporomandibular joint syndrome, myofascial pain muscular injury, fibromyalgia syndrome, bone and joint pain (osteoarthritis), rheumatoid arthritis, rheumatoid arthritis and edema resulting from trauma associated with burns, sprains or fracture of bone, pain due to osteoarthritis, osteoporosis, bone metastases or unknown reasons, gout, fibrositis, myofascial pain, thoracic outlet syndromes, upper back pain or lower back pain (wherein the back pain results from systematic, regional, or primary spine disease (radiculopathy), pelvic pain, cardiac chest pain, non-cardiac chest pain, spinal cord injury (SCI)-associated pain,
  • HAM-D Halton Rating Scale for Depression
  • the HAM-D scale may be used to assess the severity of depression in patients by means of a 24 items questionnaire. Item 4, 5 and 6 of the scale relate to how the patients sleep, i.e. is it easy to fall asleep (insomnia Early), does the patient wake up during the night (Insomnia Middle), and does the patient wake up early in the morning (Insomnia Late).
  • the compound was tested at 5 and 10 mg daily against placebo with approximately 100 patients per arm.
  • the data in FIGS. 6-8 clearly show that compound I gives rise to a large and dose dependent improvement of the sleep pattern which is superior to that provided by placebo.
  • the above mentioned clinical trial also captured sexual adverse effects reported by the patients.
  • the table below shows the number of patients reporting the specified types of sexually related adverse effects.
  • the compounds used in the present invention may be useful in the treatment of sexual dysfunctions, such as anorgasmia, delayed ejaculation, erectile dysfunction, decreased libido, abnormal orgasm, loss of libido or decreased orgasmic sensation.
  • sexual dysfunctions such as anorgasmia, delayed ejaculation, erectile dysfunction, decreased libido, abnormal orgasm, loss of libido or decreased orgasmic sensation.
  • Adverse effects which disrupt sleep and sexual activity may be very difficult to accept for patients and in particular patient on long term, not to mention chronic treatment, and they may cause treatment drop outs.
  • the absence of these adverse effects in treatments comprising the administration of compound I makes compound I particular useful in therapeutic interventions over an extended period of time, such as e.g. depression relapse prevention.
  • the compounds used in the present invention may also be useful as second line treatment for patients who cannot use other drugs, such as other anti-depressants, such as selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) due to sleep or sexually related adverse events.
  • other drugs such as other anti-depressants, such as selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) due to sleep or sexually related adverse events.
  • SSRI selective serotonin reuptake inhibitors
  • NRI selective noradrenalin reuptake inhibitors
  • SNRI noradrenaline/serotonin reuptake inhibitors
  • TCA tri-cycl
  • the unique pharmacological profile of compound I combined with an unexpectedly favourable safety profile makes compound I useful in the treatment of e.g. circadian rhythm disorder, sleep disorders, sleep-disordered breathing; hypopnea syndrome; abdominal pain; depression, in particular severe depression; dysthymic disorder; cyclothymia; exhaustive depression; atypical depression; mood disorder associated with a generalised medical disorder; substance induced mood disorder; recurrent depression, single episode depression; paediatric depression; post-stroke depression; peri-, pre- or post-menupausal dysphoric disorder; seasonal affective disorder (SAD); aggression and agitation in dementia, such as Alzheimer's; compulsive and attention spectrum disorders in ADHD, autism and Asperger's syndrome; leucariosis, small vessel disease, depression associated with abuse, irritability, hostility, sleep disorders, fatigue, Huntington's disease, multiple sclerosis, anxiety (anxious depression) and pain, in particular pain in the gastrointestinal tract, such as e.g.
  • IBS irritable bowl syndrome
  • general anxiety disorder associated with pain impulse control disease; intermittent explosive disorder; kleptomania; pyromania; pathological gambling; trichotillomania; negative symptoms of schizophrenia; mild cognitive impairment; vascular dementia; cognitive impairment associated with Down's syndrome, tph gene mutations, ADHD, epilepsy, traumatic brain injury or Asperger's syndrome; compulsive and attention spectrum disorder in ADHD, Asperger's syndrome and autism; aggression and agitation in dementia and Alzheimer's, disease; chronic fatigue syndrome; stress related disorder, acute stress; stress; burn-out; insulin resistance associated with HPA-axis hyperactivity; eating disorder, such as obesity, binge eating, anorexia and bulimia nervosa; conduct disorder; behavioural disturbances; behavioural disturbances associated with dementia; fear of flying; fear of elevators; fear of small rooms; and amblyopia.
  • the treatment of these diseases by the administration of compound I is particularly useful and beneficial because it is expected to be without sexual and sleep related adverse effects and because an effect on
  • severe depression is depression wherein the patient scores above 30, such as above 32 or above 35 on the MADRS scale.
  • the invention relates to a method of treating a diseases selected from circadian rhythm disorder; difficulties in falling asleep; nocturnal arousals; early morning awakenings; sleep-disordered breathing; hypopnea syndrome; severe depression; dysthymic disorder; cyclothymia; exhaustive depression; atypical depression; mood disorder associated with a generalised medical disorder; substance induced mood disorder; recurrent depression; single episode depression; paediatric depression; post-stroke depression; peri-, pre- or post-menupausal dysphoric disorder; seasonal affective disorder (SAD); aggression and agitation in dementia or Alzheimer's disease; compulsive and attention spectrum disorders in ADHD, autism or Asperger's syndrome; leucariosis; small vessel disease; depression associated with abuse, irritability, hostility, sleep disorders, fatigue, Huntington's disease, multiple sclerosis, anxiety (anxious depression), pain, pain in the gastrointestinal tract or irritable bowl syndrome (IBS); general anxiety disorder associated with pain; impulse control disease; intermittent
  • the patient to be treated has been diagnosed with the disease said patient is being treated for.
  • the patient to be treated has previously received medication, such as another anti-depressant, such as e.g. selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) for the treatment of said disease (or is still receiving it), which medication was ceased or reduced (or has to be ceased or reduced) due to sleep or sexually related adverse events.
  • the compounds used in the present invention are administered as second-line treatment.
  • a “therapeutically effective amount” of a compound as used herein means an amount sufficient to cure, alleviate or partially arrest the clinical manifestations of a given disease and its complications in a therapeutic intervention comprising the administration of said compound. An amount adequate to accomplish this is defined as “a therapeutically effective amount”. Effective amounts for each purpose will depend on the severity of the disease or injury as well as the weight and general state of the subject. It will be understood that determining an appropriate dosage may be achieved using routine experimentation, by constructing a matrix of values and testing different points in the matrix, which is all within the ordinary skills of a trained physician.
  • treatment means the management and care of a patient for the purpose of combating a condition, such as a disease or a disorder.
  • the term is intended to include the full spectrum of treatments for a given condition from which the patient is suffering, such as administration of the active compound to alleviate the symptoms or complications, to delay the progression of the disease, disorder or condition, to alleviate or relief the symptoms and complications, and/or to cure or eliminate the disease, disorder or condition as well as to prevent the condition, wherein prevention is to be understood as the management and care of a patient for the purpose of combating the disease, condition, or disorder and includes the administration of the active compounds to prevent the onset of the symptoms or complications. Nonetheless, prophylactic (preventive) and therapeutic (curative) treatment are two separate aspects of the invention.
  • the patient to be treated is preferably a mammal, in particular a human being.
  • the treatment of the present invention will involve daily administration of the compounds of the present invention. This may involve once daily administration, or administration twice a day or even more frequently.
  • the invention relates to the use of compound I in the manufacture of a medicament for the treatment of a diseases selected from circadian rhythm disorder; difficulties in falling asleep; nocturnal arousals; early morning awakenings; sleep-disordered breathing; hypopnea syndrome; severe depression; dysthymic disorder; cyclothymia; exhaustive depression; atypical depression; mood disorder associated with a generalised medical disorder; substance induced mood disorder; recurrent depression; single episode depression; paediatric depression; post-stroke depression; peri-, pre- or post-menupausal dysphoric disorder; seasonal affective disorder (SAD); aggression and agitation in dementia or Alzheimer's disease; compulsive and attention spectrum disorders in ADHD, autism or Asperger's syndrome; leucariosis; small vessel disease; depression associated with abuse, irritability, hostility, sleep disorders, fatigue, Huntington's disease, multiple sclerosis, anxiety (anxious depression), pain, pain in the gastrointestinal tract or irritable bowl syndrome (IBS); general
  • the medicament is for use in a patient who previously received (or is still receiving) another medication, such as another anti-depressant, such as e.g. selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) for the treatment of said disease, which medication was ceased or reduced (or has to be ceased or reduced) due to sleep or sexually related adverse events.
  • another anti-depressant such as e.g. selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) for the treatment of said disease, which medication was ceased or reduced (or has to be ceased or reduced) due to sleep or sexually related adverse events.
  • SSRI selective serotonin
  • the invention relates to compound I for use in the treatment of a disease selected from circadian rhythm disorder; difficulties in falling asleep; nocturnal arousals; early morning awakenings; sleep-disordered breathing; hypopnea syndrome; severe depression; dysthymic disorder; cyclothymia; exhaustive depression; atypical depression; mood disorder associated with a generalised medical disorder; substance induced mood disorder; recurrent depression; single episode depression; paediatric depression; post-stroke depression; peri-, pre- or post-menupausal dysphoric disorder; seasonal affective disorder (SAD); aggression and agitation in dementia or Alzheimer's disease; compulsive and attention spectrum disorders in ADHD, autism or Asperger's syndrome; leucariosis; small vessel disease; depression associated with abuse, irritability, hostility, sleep disorders, fatigue, Huntington's disease, multiple sclerosis, anxiety (anxious depression), pain, pain in the gastrointestinal tract or irritable bowl syndrome (IBS); general anxiety disorder associated with pain; impulse control
  • compound I is for use in a patient who previously received (or is still receiving) another medication, such as another anti-depressant, such as e.g. selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) for the treatment of said disease, which medication was ceased or reduced (or has to be ceased or reduced) due to sleep or sexually related adverse events.
  • another anti-depressant such as e.g. selective serotonin reuptake inhibitors (SSRI), selective noradrenalin reuptake inhibitors (NRI), noradrenaline/serotonin reuptake inhibitors (SNRI) or tri-cyclics (TCA) for the treatment of said disease, which medication was ceased or reduced (or has to be ceased or reduced) due to sleep or sexually related adverse events.
  • SSRI selective serotonin
  • Compound I is conveniently presented in a pharmaceutical composition which may be prepared by conventional methods in the art. Particular mentioning is made of tablets, which may be prepared by mixing the active ingredient with ordinary adjuvants and/or diluents and subsequently compressing the mixture in a conventional tabletting machine.
  • adjuvants or diluents comprise: anhydrous calcium hydrogen phosphate, PVP, PVP-VA co-polymers, microcrystalline cellulose, sodium starch glycolate, corn starch, mannitol, potato starch, talcum, magnesium stearate, gelatine, lactose, gums, and the like. Any other adjuvants or additives usually used for such purposes such as colourings, flavourings, preservatives etc. may be used provided that they are compatible with the active ingredients.
  • Solutions for injections may be prepared by dissolving the active ingredient and possible additives in a part of the solvent for injection, preferably sterile water, adjusting the solution to desired volume, sterilising the solution and filling it in suitable ampoules or vials. Any suitable additive conventionally used in the art may be added, such as tonicity agents, preservatives, antioxidants, etc.
  • compositions manufactured in accordance with this invention may be administered by any suitable route, for example orally in the form of tablets, capsules, powders, syrups, etc., or parenterally in the form of solutions for injection.
  • suitable route for example orally in the form of tablets, capsules, powders, syrups, etc.
  • parenterally in the form of solutions for injection.
  • methods well known in the art may be used, and any pharmaceutically acceptable carriers, diluents, excipients or other additives normally used in the art may be used.
  • compound I is administered in unit dosage form containing said compound in an amount of about 1 to 50 mg.
  • An upper limit is believed to be set by the concentration dependency of the 5-HT 3 activity.
  • the total daily dose is usually in the range of about 1-20 mg, such as about 1 to 10 mg, about 5-10 mg, about 10-20 mg, or about 10-15 mg of the compound of the invention. Particular mention is made of daily doses of 2.5, 5, 10, 15 or 20 mg.
  • Tablets comprising a compound I may conveniently be prepared by wet granulation. Using this method, the dry solids (active ingredients, filler, binder etc.) are blended and moistened with water or another wetting agent (e.g. an alcohol) and agglomerates or granules are built up of the moistened solids. Wet massing is continued until a desired homogenous particle size has been achieved whereupon the granulated product is dried.
  • Compound I is typically mixed with lactose monohydrate, corn starch and copovidone in a high shear mixer together with water. Following formation of granulates, these granulates may be sieved in a sieve with a suitable sieve size, and dried.
  • the resulting dried granulates are then mixed with microcrystalline cellulose, croscarmellose sodium and magnesium stearate, following which the tablets are pressed.
  • wet granulation of the compounds of the present invention may be achieved using mannitol, corn starch and copovidone, which granulates are mixed with microcrystalline cellulose, sodium starch glycolate and magnesium stearate before tablets are pressed.
  • wet granulation of compound I may be achieved by using anhydrous calcium hydrogen phosphate, corn starch and copovidone, which granulates are mixed with microcrystalline cellulose, sodium starch glycolate (type A), talc and magnesium stearate before tablets are pressed.
  • Copovidone is a PVP-VA copolymer.
  • compound I is the hydromide acid salt, e.g. in the beta form, and suitable tablets may be composed as follows—percentages indicated are w/w-%
  • the tablets may be composed as follows
  • HBr salt approximately 5%
  • Anhydrous calcium hydrogen phosphate approximately 39% Corn starch approximately 20% Copovidone approximately 3%
  • Microcrystalline cellulose approximately 25%
  • Sodium starch glycolate approximately 3%
  • Talc approximately 4%
  • Magnesium stearate approximately 1% Tablets with different amounts of active compound, such as corresponding to e.g. 2.5, 5, 10, 20, 25, 30, 40, 50, 60 or 80 mg of the free base may be obtained by choosing the right amount of the compound I in combination with a tablet of an appropriate size.
  • Compound I may either be administered alone or in combination with another therapeutically active compound, wherein the two compounds may either be administered simultaneously or sequentially.
  • therapeutically active compounds which may advantageously be combined with compound I include sedatives or hypnotics, such as benzodiazepines; anticonvulsants, such as lamotrigine, valproic acid, topiramate, gabapentin, carbamazepine; mood stabilizers such as lithium; dopaminergic drugs, such as dopamine agonists and L-Dopa; drugs to treat ADHD, such as atomoxetine; psychostimulants, such as modafinil, ketamine, methylphenidate and amphetamine; other antidepressants, such as mirtazapine, mianserin and buproprion; hormones, such as T3, estrogen, DHEA and testosterone; atypical antipsychotics, such as olanzapine and aripiprazole; typical antipsychotics, such as haloperidol; drugs to
  • the free base of compound I may be prepared as disclosed in WO 2003/029232 or WO 2007/144005.
  • Salts used in the present invention may be prepared by dissolving the free base in an appropriate solvent, adding the relevant acid, followed by precipitation. Precipitation may be accomplished either by the addition of a second solvent, and/or evaporation, and/or cooling.
  • the free base used in the present invention may be synthesised in a palladium catalysed reaction as described in the examples.
  • the melting points are measured using Differential Scanning Calorimetry (DSC).
  • the equipment is a TA-Instruments DSC-Q1000 calibrated at 5°/min to give the melting point as onset value.
  • About 2 mg of sample is heated 5°/min in a loosely closed pan under nitrogen flow.
  • Thermo gravimetric analysis (TGA) used for estimation of solvent/water content of dried material is performed using a TA-instruments TGA-Q500. 1-10 mg sample is heated 10°/min in an open pan under nitrogen flow.
  • X-Ray powder diffractograms were measured on a PANalytical X'Pert PRO X-Ray Diffractometer using CuK ⁇ 1 radiation. The samples were measured in reflection mode in the 2 ⁇ -range 5-40° using an X'celerator detector. The reflection values provided are ⁇ 0.1 (°2 ⁇ ).
  • Rat serotonin transporter IC 50 5.3 nM (blockade of 5-HT uptake)
  • Human serotonin transporter IC 50 5.4 nM (blockade of 5-HT uptake)
  • Rat 5-HT 3 receptor IC 50 0.2 nM (antagonism in functional assay)
  • Human 5-HT 3A receptor IC 50 around 20 nM (antagonism in functional assay). At higher concentration, the compound exhibits agonistic activity with an ED 50 of 2.1 ⁇ M. The compound of the invention also showed high affinity for the human 5HT 3 receptor in an in vitro binding assay (Ki 4.5 nM).
  • NMR complies with structure.
  • the base as prepared in example 2b, is crystalline (XRPD)—see FIG. 1 . It has a melting point of ⁇ 117° C. It is not hygroscopic and has a solubility of 0.1 mg/ml in water.
  • the alpha form of the hydrobromide, as prepared in example 2d, is crystalline (XRPD)—see FIG. 2 . It has a melting point of ⁇ 226° C. It absorbs about 0.3% of water when exposed to high relative humidity and has a solubility of 2 mg/ml in water.
  • the beta form of the hydrobromide, as prepared in example 2f, is crystalline (XRPD) see FIG. 3 . It has a melting point of ⁇ 231° C. It absorbs about 0.6% of water when exposed to high relative humidity and has a solubility of 1.2 mg/ml in water.
  • the hydrobromide, as prepared in example 2h is crystalline (XRPD)—see FIG. 4 .
  • the DSC curve shows some thermal events at about 100° C.; probably change in crystal form. Then it melts at about 220° C. It absorbs about 4.5% of water when exposed to high relative humidity and at 30% RH at room temperature about 2% of water is absorbed.
  • the hydrate as prepared in Example 2j is crystalline (XRPD)—see FIG. 5 .
  • the water content depends strongly on the relative humidity. At room temperature and 95% RH the water content is about 3.7%. Dehydration occurs by heating to about 100° C.
  • mice receive an injection of formalin (4.5%, 20 ⁇ l) into the left hind paw.
  • the irritation caused by the formalin injection elicits a characteristic biphasic behavioural response, as quantified by the amount of time spent licking the injured paw.
  • the first phase ( ⁇ 0-10 minutes) represents direct chemical irritation and nociception, whereas the second phase ( ⁇ 20-30 minutes) is thought to represent pain of neuropathic origin.
  • the two phases are separated by a quiescent period in which behaviour returns to normal.
  • the effectiveness of test compounds to reduce the painful stimuli is assessed by counting the amount of time spent licking the injured paw in the two phases.
  • Compound I showed a significant reduction in second phase pain scores ( FIG. 9 a ), indicating efficacy against pain of neuropathic origin. Furthermore, the compounds of the present invention showed a significant reduction in the first phase scores ( FIG. 9 b ), indicating a more analgesic action at the highest dose. In summary, these results indicate that compounds of the present invention are likely to be effective in the treatment of pain disorders.
  • the animals were administered 1-[2-(2,4-dimethylphenylsulfanyl)phenyl]piparazine, HBr salt.
  • mice Male Sprague-Dawley rats, initially weighing 275-300 g, were used. The animals were housed under a 12-hr light/dark cycle under controlled conditions for regular in-door temperature (21 ⁇ 2° C.) and humidity (55 ⁇ 5%) with food and tap water available ad libitum.
  • Rats were anaesthetised with hypnorm/dormicum (2 ml/kg) and intracerebral guide cannulas (CMA/12) were stereotaxically implanted into the brain, aiming at positioning the dialysis probe tip in the ventral hippocampus (co-ordinates: 5.6 mm posterior to bregma, lateral ⁇ 5.0 mm, 7.0 mm ventral to dura) or in the prefrontal cortex (co-ordinates: 3.2 mm anterior to bregma; lateral, 0.8 mm; 4.0 mm ventral to dura). Anchor screws and acrylic cement were used for fixation of the guide cannulas. The body temperature of the animals was monitored by rectal probe and maintained at 37° C. The rats were allowed to recover from surgery for 2 days, housed singly in cages. On the day of the experiment a microdialysis probe (CMA/12, 0.5 mm diameter, 3 mm length) was inserted through the guide cannula.
  • the probes were connected via a dual channel swivel to a microinjection pump. Perfusion of the microdialysis probe with filtered Ringer solution (145 mm NaCl, 3 mM KCl, 1 mM MgCl 2 , 1.2 mM CaCl 2 containing 0.5 ⁇ M neostigmine) was begun shortly before insertion of the probe into the brain and continued for the duration of the experiment at a constant flow rate of 1 ⁇ l/min. After 180 min of stabilisation, the experiments were initiated. Dialysates were collected every 20 min. After the experiments the animals were sacrificed, their brains removed, frozen and sliced for probe placement verification.
  • filtered Ringer solution 145 mm NaCl, 3 mM KCl, 1 mM MgCl 2 , 1.2 mM CaCl 2 containing 0.5 ⁇ M neostigmine
  • the compound dissolved in 10% HPbetaCD and injected subcutaneously (2.5-10 mg/kg). Doses are expressed as mg salt/kg body weight. The compound was administered in a volume of 2.5 ml/kg.
  • acetylcholine (ACh) in the dialysates was analysed by means of HPLC with electrochemical detection using a mobile phase consisting of 100 mM disodium hydrogenphosphate, 2.0 mM octane sulfonic acid, 0.5 mM tetramethyl-ammonium chloride and 0.005% MB (ESA), pH 8.0.
  • a pre-column enzyme reactor (ESA) containing immobilised choline oxidase eliminated choline from the injected sample (10 ⁇ l) prior to separation of ACh on the analytical column (ESA ACH-250); flow rate 0.35 ml/min, temperature: 35° C.
  • ESA post-column solid phase reactor
  • the compound administered in the present experiment was 1-[2-(2,4-dimethylphenyl-sulfanyl)phenyl]piperazine HBr salt.
  • Rats Male male Sprague-Dawley rats (weighing 250-300 g at time of training) from Charles River Laboratories, housed two per cage under a 12 h light/dark cycle, were used. Food and water were available ad libitum. Rats were used 1 week after arrival. The compound was dissolved in 10% HPbetaCD and injected subcutaneously. The drug was administered in a volume of 2.5 ml/kg.
  • Training and testing were conducted in a soundproof chamber (30 ⁇ 20 ⁇ 40 cm) housed in an isolated room and connected to a ventilation system. Illumination was provided by a white light (60 Watt).
  • the floor of the chamber consisted of a metal grid attached to an electric shock generator. Prior to training and testing, the chamber was cleaned with a 70% ethanol solution.
  • a video camera allowed for behavioral observations and recording of the training session for off-line analysis.
  • the fear conditioning model is a standard procedure described in the literature for the investigation of learning and memory.
  • the compound was administered at 5, 10 and 20 mg/kg after the acquisition session. Consequently, in this set of experiments, the compound was onboard neither during the acquisition nor throughout the retention test.
  • the percentage of time spent freezing during the context re-exposure has been described as a measure of a fear-related memory [ Pavlov J. Biol. Sci , 15, 177-182, 1980], which is enhanced in compound-treated rats when compared to vehicle-treated animals ( FIGS. 11 and 12 ). Taken together, the data show that the compound enhances contextual memory.

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US9820984B1 (en) 2016-07-01 2017-11-21 H. Lundbeck A/S Dosing regimens for fast onset of antidepressant effect
US9913839B2 (en) 2016-07-01 2018-03-13 H. Lundbeck A/S Dosing regimens for fast onset of antidepressant effect
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